//package com.ln.service.impl;
//
//import com.ln.dao.StockDao;
//import com.ln.entity.Stock;
//import com.ln.service.StockService;
//import org.springframework.beans.factory.annotation.Autowired;
//import org.springframework.stereotype.Service;
//
///**
// * @author Ln
// * @version 终极版
// * @date 2022/12/8 16:01
// */
//@Service
//public class StockServiceImpl implements StockService {
//    @Autowired
//    private StockDao stockDao;
//
//    @Override
//    public String decrement(int isbn) {
//        synchronized (StockServiceImpl.class.getClassLoader()) {
                //1. 查找指定商品的库存
//            Stock stock = stockDao.selectById(isbn);
                //2. 判断库存数是否大于0
//            if (stock.getStock() > 0) {
                //3.减库存
//                stock.setStock(stock.getStock() - 1);
//                stockDao.updateById(stock);
//
//                System.out.println("商品编号为:" + isbn + "的商品库存剩余:" + stock.getStock() + "个");
//                return "商品编号为:" + isbn + "的商品库存剩余:" + stock.getStock() + "个";
//            } else {
//                System.out.println("商品编号为:" + isbn + "的商品库存不足。");
//                return "商品编号为:" + isbn + "的商品库存不足。";
//            }
//        }
//    }
//}
